Bone fixing system and method of use

ABSTRACT

A bone fixing system useful for holding bone in position, and a method for installing the same are disclosed. The ends of a conformable ligature are passed around bones, bone grafts, tendons, plates, rods, fasteners, or other anatomical or implanted structures, and the like to form a loop extending from a first portion of a body. The ends of the conformable ligature are passed through the body and extend out a second portion of the body. The ends may be attached to a tensioning tool and a selected tension may be applied. A closure member may engage an engagement portion of the body to create a friction force to hold the conformable ligature in place without significant movement relative to the body.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/248,749, filed Sep. 29, 2011; which is a continuation of U.S. patentapplication Ser. No. 12/682,001, filed Apr. 7, 2010; which is a nationalstage application, filed under 35 U.S.C. 371, of International PatentApplication No. PCT/EP2008/063682, filed Oct. 10, 2008; which claimspriority to European Patent Application No. EP 07301454, filed Oct. 11,2007. All applications listed herein are incorporated by reference intheir entireties.

TECHNICAL FIELD

This disclosure relates generally to systems and methods for fixingbone. In particular, embodiments of the disclosure may be helpful forholding bones, rods, or other structures in a desired configuration orin a particular relative position.

BACKGROUND

One field of application for the disclosure is holding bones in arelative position, for example to aid in healing of breaks orpositioning bones in the treatment of scoliosis or otherwise to correctabnormal curvatures of the spine. Other bone deficiencies andabnormalities may also benefit from embodiments of the presentdisclosure.

The spine is formed of superposed vertebrae, normally aligned along avertebral axis, from the lumbar vertebrae to the cervical vertebrae,each having a posterior wall from which projects a spinous process andtwo lateral edges from the walls of which there project ribs and/ortransverse processes. If the spine of a person has abnormal curvature,the vertebrae are typically inclined relative to one another andrelative to said vertebral axis. The lateral edges of the vertebrae onone side are therefore closer together and form a concave shape whilethe lateral edges on the other side are farther apart and form a convexshape.

In order to straighten the vertebral column as a remedy for thissituation, the lateral edges of the vertebrae on the concave side can bemoved away from one another and supported at distances from one anothersubstantially equivalent to the distances between the lateral edges onthe other side. Devices known in the art to hold the vertebrae relativeto one another include screws that are inserted into the vertebrae orhooks that are inserted along the internal wall of the spinal canal androds adapted to connect the screws or hooks.

When using a hook and rod system, pairs of hooks are generally insertedinto each vertebra, one on each side, near the pedicle. The hookstypically have heads that project from the posterior wall of thevertebra, one on each side of the spinous process. The heads can betulip-shaped and adapted to receive a rod that is immobilized by a nutscrewed onto the head and contacting the rod. The heads of the hookssituated on either side of the spinous process can then be connectedtogether and fixed in position by two rods approximately parallel to oneanother and to the axis of the spine.

However, using such hooks can be difficult because their use increasesthe risk that the physician (or other operative) might contact andpotentially damage the spinal cord that extends along the center of thespinal canal (which can result in paralysis of the patient).

Using a screw and rod system reduces this risk, but has other drawbacks.The screws typically have tulip-shaped heads and are inserted in pairsinto the pedicles on each side of the spinous process on the posteriorwall of the vertebrae. The screws therefore constitute fixing points onthe vertebrae for holding the vertebrae in a fixed position relative toone another. However, the screws are inserted into the pedicles of thevertebrae, which in some cases are small or have deteriorated and can bedamaged or do not provide sufficient purchase to permanently hold thescrew.

SUMMARY

A bone fixing system and method of use for holding a bone, portions of abone or multiple bones in a fixed relative position that providesadvantages over conventional bone fixing systems and methods of use. Inone embodiment, the bone fixing system and method of use provides theability to hold bones in a fixed relative position when it is notpossible or practicable to insert screws into the vertebrae and whenusing hooks may increase dangers to the patient.

One embodiment of the disclosure is directed to a bone fixing system forholding a bone in a position including a conformable ligature with afirst end and a second end and a loop portion, a blocking body having aloop passage, an exit passage, an engagement portion, a closure memberfor engagement with the engagement portion of the blocking body, and acompression member having a first surface. In some embodiments, theclosure member engages with the blocking body so that the first surfaceof the compression member contacts the conformable ligature to create afriction force between the conformable ligature and the blocking body.In some embodiments, the loop portion passes through the loop passageand the first and second ends extend from the exit passage. In someembodiments, the friction force is great enough to hold the conformableligature in place without significant (or in some cases without any)movement relative to the blocking body. The exit passage can include afirst exit passage and a second exit passage and further wherein thefirst end passes through the first exit passage and the second endpasses through the second exit passage.

The blocking body can include a compression member opening for receivingthe compression member and the compression member can have a secondsurface for contacting the closure member. In some embodiments, at leastone extension maintains the position of the compression member in theblocking body. In some embodiments, said extension protrudes from theouter surface of the compression member and is arranged to abut againstthe blocking body for maintaining the position of the compression memberin the blocking body. In other embodiments, said extension protrudesfrom the inner surface of the blocking body and is arranged to abutagainst the compression member for maintaining the position of thecompression member in the blocking body. In some embodiments, theclosure member comprises a bottom surface for contact with the secondsurface of the compression member. In some embodiments, engagement ofthe closure member biases the bottom surface of the closure member withthe second surface of the compression member to create a friction forcebetween the conformable ligature and the blocking body.

The engagement portion can be a threaded engagement portions thatincludes external threads, while the closure member can be an internallythreaded closure member where the closure member engages with theengagement member by rotation to engage the sets of threads. In oneembodiment the threaded engagement portion can be a threaded hole sizedto receive a closure member that is a screw.

In the previously described and/or alternative embodiments, the blockingbody can be a U-shaped channel defined by two upwardly extending arms.In some embodiments, the blocking body includes a first portion and asecond portion, wherein the first portion is connected with the secondportion via a hinge. In some embodiments, the first or second portioncomprises the compression member. In some embodiments, engagement of theclosure member to the blocking collapses the first portion relative tothe second portion to create the friction force between the conformableligature and the blocking body.

In one embodiment, the bone fixing system includes a tensioning toolwith a tool body having an attachment point for connecting to first andsecond ends of the conformable ligature, a longitudinal member foradvancement in the tool body, and a distal end for engagement with theblocking body. In some embodiments of the bone fixing system and methodof use, the tensioning tool tensions one or more ends of the conformableligature when the distal end is engaged with the blocking body, one ormore ends of the conformable ligature are attached to the tool body, andthe longitudinal member is advanced through the tool body.

Yet another embodiment is directed to a method for holding a bone in aposition, comprising the steps of passing a conformable ligature aroundone or more structures in a body, passing first and second ends of theconformable ligature through a loop passage in a blocking body to form aloop extending from a first portion of the blocking body, passing thefirst and second ends out the exit passage of the blocking body toextend from a second portion of the blocking body, applying tension tothe conformable ligature, and engaging the closure member in theengagement portion to hold the conformable ligature in place withoutsignificant movement relative to the blocking body.

In some embodiments, a blocking body comprises a loop passage, an exitpassage, a threaded portion, a threaded closure member for engagementwith the threaded portion, and a compression member having a firstsurface. In some embodiments, advancing the longitudinal membercomprises tensioning the conformable ligature to position a structurerelative to another structure. In some embodiments, a structurecomprises a bone, a bone fastener, a tendon, a bone graft, a plate, or arod.

These, and other, aspects of the disclosure will be better appreciatedand understood when considered in conjunction with the followingdescription and the accompanying drawings. The following description,while indicating various embodiments of the disclosure and numerousspecific details thereof, is given by way of illustration and not oflimitation. Many substitutions, modifications, additions orrearrangements may be made within the scope of the disclosure, and thedisclosure includes all such substitutions, modifications, additions orrearrangements.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a fragmentary diagrammatic perspective view showing avertebral fixing system of the disclosure and a rod.

FIG. 2 is a diagrammatic view in vertical section of the subject matterof the disclosure mounted on a rod.

FIG. 3 is a diagrammatic perspective view in section of the subjectmatter of the disclosure.

FIG. 4 is a diagrammatic view in elevation of the subject matter of thedisclosure mounted on a vertebra.

FIG. 5 is a perspective view of a first embodiment of a vertebral fixingsystem.

FIGS. 6A, 6B, and 6C are vertical section views of the fixing systemshowing the use of said system as shown in FIG. 5.

FIG. 7 is a face view showing the FIG. 5 fixing system put into place ona vertebra.

FIG. 8 is a perspective view of a second embodiment of the fixingsystem, the ligature not being shown.

FIG. 9 is an exploded view of the connection device of FIG. 8.

FIG. 10 is a plan view of a portion of the FIG. 9 connection device.

FIG. 11 is a section view on line XI-XI of FIG. 10.

FIG. 12 is a face view of the fixing system of the second embodiment.

FIGS. 13A and 13B are section views on line VII-VII of FIG. 12 showingtwo ways in which the flexible ligature can be put into place.

FIG. 14 depicts a cross-sectional end view of one embodiment of a bonefixing system.

FIG. 15 depicts an exploded perspective view of one embodiment of ablocking body.

FIG. 16 depicts a perspective view of one embodiment of a compressionmember.

FIG. 17 depicts a cross-sectional end view of one embodiment of a bonefixing system.

FIG. 18 depicts a side view of one embodiment of a bone fixing system.

FIG. 19 depicts an exploded view of one embodiment of a blocking body.

FIG. 20 depicts an exploded view of one embodiment of a bone fixingsystem.

FIG. 21 depicts a side view of one embodiment of a blocking body.

FIG. 22 depicts an exploded view of a portion of a blocking body.

FIG. 23 depicts a cross-sectional end view of one embodiment of a bonefixing system.

FIG. 24 depicts a side view of one embodiment of a blocking body.

FIG. 25 depicts an exploded view of one embodiment of a blocking body.

FIG. 26 depicts a perspective view of one embodiment of a blocking body.

FIG. 27 depicts a cross-sectional side view of one embodiment of a bonefixing system.

FIG. 28 depicts a perspective view of one embodiment of a bone fixingsystem.

FIG. 29 depicts a perspective view of one embodiment of a bone fixingsystem attached to a portion of bone.

FIG. 30 depicts a posterior view of one embodiment of a bone fixingsystem attached to a portion of a bone.

FIG. 31 depicts a sagittal view of one embodiment attached to a portionof a spine, illustrating a method for repairing a spine.

FIGS. 32-38 depict views of a bone fixing system implanted on a spine.

FIG. 39 depicts a side view of one embodiment of a tensioning tool for abone fixing system.

DETAILED DESCRIPTION

The disclosure and the various features and advantageous details thereofare explained more fully with reference to the non-limiting embodimentsthat are illustrated in the accompanying drawings and detailed in thefollowing description. Descriptions of well known starting materials,processing techniques, components and equipment are omitted so as not tounnecessarily obscure the disclosure in detail. Skilled artisans shouldunderstand, however, that the detailed description and the specificexamples, while disclosing preferred embodiments of the disclosure, aregiven by way of illustration only and not by way of limitation. Varioussubstitutions, modifications, additions or rearrangements within thescope of the underlying inventive concept(s) will be apparent to thoseskilled in the art after reading this disclosure.

A bone fixing system may be installed in a patient to hold or fix onestructure in a selected relation with one or more other structures. Asused herein, the term structure may refer to bones, portions of bones,or bone implants, as well as rods, elongated members, plates, or otherimplanted man-made devices. Among other methods, a bone fixing system asdescribed herein may be installed using a minimally invasive surgery(MIS) procedure. In one embodiment, the bone fixing system and method ofuse may include instruments and bone fixing components for maintainingone or more structures in a selected alignment.

Components of bone fixing systems in accordance with the disclosure maybe made of materials including, but not limited to, titanium, titaniumalloys, stainless steel, ceramics, and/or polymers. Some components of abone fixing system may be autoclaved and/or chemically sterilized.Components that may not be autoclaved and/or chemically sterilized maybe made of sterile materials. Components made of sterile materials canbe used with other sterile components during assembly of a bone fixingsystem.

Embodiments of bone fixing systems disclosed herein are useful inrepairing broken bones, correcting curvatures of the spine and for othersurgical procedures that hold structures (e.g., bones) in a fixedrelative position. Embodiments of the bone fixing system and method ofuse disclosed herein can be particularly useful for minimally invasivesurgery (MIS) procedures, which can reduce trauma to soft tissue due tothe relatively small incision made in a patient. For example, a surgicalprocedure may be performed through a 2 cm to 4 cm incision formed in theskin of the patient. Dilators, a targeting needle, and/or a tissue wedgemay be used to provide access to structures without the need to form alarger incision with a scalpel through muscle and other tissue. Aminimally invasive surgery (MIS) procedure may reduce an amount ofpost-operative pain felt by a patient as compared to invasiveprocedures. A minimally invasive procedure may also reduce recovery timefor the patient as compared to invasive procedures. In some embodiments,the natural flexibility of skin and soft tissue may be used to limit thelength and/or depth of an incision or incisions needed during theprocedure. Minimally invasive procedures may provide limited directvisibility in vivo.

Bone fixing systems may be used to correct problems due to spinalinjury, deformity, or disease. For example, various embodiments of abone fixing system may be used from the C1 vertebra to the sacrum tocorrect spinal problems. For example, a bone fixing system may beimplanted posterior to the spine to maintain distraction betweenadjacent vertebral bodies in a lumbar portion of the spine. Variousembodiments of a bone fixing system may be used to correct orthopedicdeficiencies. Embodiments of the disclosure may be useful for holdingtendons, bones, or muscles during the healing process and may beimplanted using MIS procedures and thus it is in this context thatembodiments of the disclosure may be described. It will be appreciated,however, that embodiments of the systems and methods of the presentdisclosure may be applicable for stabilizing other areas of the body.

FIG. 1 shows one embodiment of a bone fixing system, specifically avertebral fixing system 10 of the disclosure mounted on a rod 18. Thevertebral fixing system comprises a connecting part 12 having twolongitudinal members, of which a first longitudinal member 22 extendsbetween a first end 22 a and a second end 22 b and a second longitudinalmember 20 extends between a first end 20 a and a second end 20 b. Thetwo longitudinal members 22 and 20 are pivoted together at their firstends 20 a and 22 a for the purposes of mounting the system. The firstend 22 a of the longitudinal member 22 has a notch 25 with two oppositeedges 28 and 30 and between which the first end 20 a of the otherlongitudinal member 20 may be inserted. A pivot pin 24 passes throughthe two first ends 20 a and 22 a and is free to rotate in at least oneof said ends 20 a and/or 22 a. The second end 22 b of the firstlongitudinal member 22 includes a bore 28 into which a screw 26 may beinserted. The second end 20 b of the second longitudinal member 20comprises a thread 38 which is aligned with said bore 28 when the twolongitudinal members are disposed facing each other, with the resultthat the screw 26 may be screwed into said thread 38 in order to drivethe second ends 20 b and 22 b of the two longitudinal members 20 and 22towards each other. The consequences of screwing said screw 26 into thethread 38, thereby forming the adjustable locking means, are explainedin more detail hereinafter. FIG. 1 also shows a first orifice 40 throughwhich a ligature may be stretched. The method of connecting saidligature to said connecting part is described with reference to FIG. 2.

FIG. 2 shows the connecting part 12 consisting of the first longitudinalmember 22 and the second longitudinal member 20, said longitudinalmembers 22 and 20 pivoting about the pin 24 that joins them. Theadjustable locking means consisting of said screws 26 passing throughthe bore 28 and screwed into the thread 38 to immobilize said connectingpart 12 relative to the rod 18 and fix in position a portion of aligature 14 shown in part in FIG. 2.

The ligature 14 consists of an elongate flexible member capable ofconforming to the contour of the parts that it must connect.

The ligature 14 has a first end 44 that is ligated around the pin 24 anda free second end 42 that is inserted into a passage 48 between the rod18 and the internal walls 50 and 52 of the longitudinal members 22 and20 and the external wall of the rod 18. As shown in FIG. 2, the secondlongitudinal end 20 a includes a second orifice 54 through which saidligature 14 passes. Moreover, as shown in FIG. 4, the ligature 14 may beformed into a loop 56 in which the transverse process is trapped. Insome embodiments, the ligature 14 may also trap the rib.

As shown in FIG. 3, which shows the second longitudinal member 20, themiddle part has a first portion through which said ligature 14 passesand a second portion 58 adapted to bear directly on the rod 18. In someembodiments, the passage 48, which is symmetrical inside the firstlongitudinal member 20, is produced by a groove formed in each of thetwo facing faces of the middle parts of the longitudinal members 22 and20.

In some embodiments, the first portion of the middle part forms an edgewith cylindrical symmetry and the corresponding second portion of themiddle part 58 of the first longitudinal member 22 forms a substantiallycylindrical space 60 into which said rod 18 is inserted.

FIG. 2 shows that the second portion 58 of the middle part comes intocontact with the rod 18 and is adapted to bear on top of it and thefirst portion presses the free second end of said ligature 14 againstthe rod 18. The adjustable locking means therefore drive thelongitudinal members 22 and 20 forcibly against the rod 18 andsimultaneously against the ligature 14, which is also forcibly pressedagainst the rod 18.

In some embodiments, as shown in FIG. 2, the passage 48 has a section S1in the vicinity of the orifice 54 greater than the section S2 in thevicinity of the first orifice 40, the section of said passage 48decreasing progressively in the direction from the second orifice 54 tothe first orifice 40. The ligature 14 is therefore progressivelycompressed around a portion of the rod 18 with a pressure that increasesin the direction from the second orifice 54 towards the first orifice40.

FIG. 4 shows a vertebral fixing system of the disclosure mounted on avertebra having a transverse process. This figure shows again the rod 18and the two longitudinal members 22 and 20 that grip it and press aportion of the ligature 14 against said rod 18.

In FIG. 4, the flexible ligature 14 consists of a flexible strip ofsubstantially constant width and thickness whose first end is ligated tothe pin 24, the ligature 14 surrounding the transverse process of thevertebra being inserted through the connecting part 12. The section ofthe flexible strip 14 is substantially rectangular so that, the pin 24and the rod 18 being substantially perpendicular to the transverseprocess, the ligature 14 has to be partly twisted in order to insert itinto the passage 48 and between the pin 24 and the point at which itcontacts the transverse process. The connecting part 12 is fixed inposition against the posterior wall of the vertebra despite thesepartially twisted portions, the ligature 14 being forcibly tensioned bystretching the free second end 14.

The ligature 14 is advantageously made from a flexible material such aspolyester that may be lightly crushed locally to immobilize it with aclamping effect.

One aspect of the disclosure relates to a spine straightening assemblycomprising a plurality of vertebral fixing systems conforming to thepresent disclosure and mounted on a plurality of successive vertebrae,on all the transverse processes of one lateral wall thereof, andconnected to a single rod that is disposed substantially parallel tosaid spine. The transverse processes of a portion of the spine cantherefore be connected together by a single longitudinal rod, to fixthem in position relative to each other, by means of the above vertebralfixing system.

In some embodiments, flexible ligature 14 may not be ligated around pin24 or otherwise fixed to connecting part 12. As shown in FIG. 5, in oneembodiment, a vertebral fixing system comprises a connecting part 12, aflexible ligature 14, and adjustable locking means 16. The flexibleligature 14 is of elongate shape and is capable of matching the outlineof the parts it is to connect together. In this figure, there can alsobe seen the rod 18 that is to be secured to the vertebra by means of thevertebral fixing system. In the first embodiment, the connecting part 12is constituted by two longitudinal elements given respective references22 and 20, each having a first end 22 a, 20 a and a second end 22 b, 20b.

In FIG. 6A, the longitudinal elements 22 and 20 are hinged to each otherat their first ends 22 a, 20 a about a pivot pin 24.

In the embodiment described, the locking means are constituted by ascrew 26 having a head 26 a that is engaged in a bore 28 formed in thesecond end 22 b of the longitudinal element 22. The second end 20 b ofthe longitudinal element 20 is pierced by a tapped bore 38 forco-operating with the threaded shank 26 b of the screw 26. Eachlongitudinal element 20, 22 has an outside face 20 c, 22 c and an insideface 20 d, 22 d. The longitudinal elements 20 and 22 are mounted in sucha manner that the inside faces 20 d, 22 d of the longitudinal elementsface each other. The inside faces 20 d, 22 d of the longitudinalelements 20 and 22 have respective mutually-facing recesses 30 and 32,each of substantially semi-cylindrical shape. The recesses 30 and 32define walls 34 and 36 which are ruled surfaces having generator linesparallel to the pivot axis 24. Finally, slots 54 and 40 cause thebottoms of the recesses 30 and 32 to communicate with the outside faces20 c and 22 c of the longitudinal elements 20 and 22. As explainedbelow, the recesses 30 and 32 are for receiving the rod 18 together witha strand of the ligature 14, the slots 54 and 40 serving to pass theligature 14.

With reference to FIGS. 6A, 6B and 6C, there follows an explanation ofhow the fixing system is used.

In FIG. 6A, there can be seen the longitudinal elements 20 and 22 in thespaced-apart position, a position in which the locking means 16 are notactive, the threaded shank 26 b of the screw 26 not being engaged in thebore 38. The ligature 14 is engaged in the slots 54 and 40 of thelongitudinal elements against one portion of the inside wall 34, 36 ofthe recesses 30 and 32. The rod 18 is then introduced into the recess 30of the longitudinal element 20 so that the two strands 42 and 44 of theligature 14 are disposed between the inside wall of the recesses 30 and32 and the side face 18 a of the rod 18. These two surfaces define apassageway 48 for passing the ligature 14 and having portions 42 and 44of the ligature 14 placed therein.

As shown in FIG. 6B, the portions 42 and 44 of the ligature 14 define aportion of the ligature 14 that forms a loop that extends beyond theoutside face 20 c of the longitudinal element 20, and also two freeportions 42 and 44 that extend beyond the outside face 22 c of thelongitudinal element 22. When the longitudinal elements 20 and 22 arespaced apart as shown in FIG. 6B, the ligature 14 can slide freely alongthe passageway 48. Once the ligature 14 is placed around the transverseprocess or a rib or indeed a portion of the posterior arc of a vertebra,the surgeon engages the threaded shank 26 b of the screw 26 in thetapped bore 38, causing the longitudinal element 22 to comeprogressively closer to the longitudinal element 20. This approachsimultaneously reduces the section of the passageway 48 in which theportions 42 and 44 of the ligature 14 are engaged and simultaneouslyintroduces a certain coefficient of friction between the ligature andrespectively the rod 18 and the walls of the recesses 30 and 32.Nevertheless, it is still possible for the surgeon to extract tractionon the free ends 42 and 44 of the ligature 14 until sufficient tensionis obtained in the ligature around the vertebral process. Once thetension in the ligature is sufficient for providing appropriatefastening, the surgeon finishes off tightening the screw 26 in thetapped bore 38, thus locking the longitudinal elements 20 and 22together. Advantageously, the portions 42 and 44 of the ligature 14 arepinched between the rod 18 and the wall of the recesses 30 and 32.

In this locking position, the rod 18 is thus secured to the ligature 14via the connecting part 12.

Advantageously, because the surgeon exerts traction only on the freeends 42 and 44 of the ligature 14, there is no risk of jamming betweenthe ligature 14 and the bottom face of the transverse process or of therib, thus guaranteeing that effective fastening is provided with thetransverse process or the rib or indeed a portion of the posterior arcof a vertebra. FIG. 7 depicts a face view where reference AT identifiesthe transverse process.

In the above description, both of the portions 42 and 44 of the ligature14 are disposed in the recesses 30 and 32 on the same side of the rod18. In some embodiments, the portions 42 and 44 of the ligature 14 maybe placed on opposite sides of the rod 18. Under such circumstances, itshould be considered that the outside face 18 a of the rod 18 and theinside walls of the recesses 30 and 32 define two passageways,respectively for passing each of the portions 42 and 44 of the ligature14.

FIGS. 8 to 13B depict various view of one embodiment of the fixingsystem. In these figures, there can be seen the rod 18, the connectingpart 12, and the flexible ligature 14.

In this embodiment, the connecting part 12 is constituted by a part 55that is generally U-shaped. The inside wall of this part 55 isconstituted by a bottom 57 of substantially semi-cylindrical shape andby two substantially plane portions 53 and 54 that correspond to the twolimbs of the part 55. The width of the recess 58 formed in the part 55is substantially equal to the diameter of the rod 18. On its outsideface 59 which is circularly symmetrical about a longitudinal axis of thepart 55, there is provided a thread 60 occupying its upper portion. Thethread 60 is located entirely above the rod 18 when it is put into placein the recess 58. The thread 60 is designed to co-operate with aclamping ring 62 that constitutes the adjustable locking means. Thisring has a slightly frustoconical bore 64 with an inside face 66 thatcarries tapping 68.

In some embodiments, when the ring 62 is screwed tight on the threadedportion 60 of the part 55, it deforms the limbs of the part 55elastically, thereby pinching and clamping strands of the ligature 14between the rod 18 and the inside wall(s) of the recess 58, in a mannerexplained below.

As shown in FIGS. 10 and 11, the part 55 includes in its bottom 70 apassage 72 for passing the ligature 14 in a manner explained below.

With references to FIGS. 12, 13A, and 13B, there follows a descriptionof two different ways of putting the flexible ligature 14 into placeinside the connecting part 12 in the second embodiment. The side wall ofthe rod 18 and the inside wall of the recess 58 of the part 55potentially define two passageways 74 and 76 for passing the middlestrands of the flexible ligature 14. In the configuration shown in FIG.13A, only the passageway 74 is used. Thus, both intermediate portions 42and 44 of the flexible ligature 14 are disposed in the passage 74.

In the configuration shown in FIG. 13B, the middle portions 42 and 44 ofthe flexible ligature 14 are disposed respectively one in each of thepassageways 74 and 76, i.e. on either side of the rod 18.Advantageously, the free ends of the ligature 14 are accessible forexerting the desired traction in order to obtain suitable clamping onthe spinous process prior to locking the clamping ring 62 on the part55.

One advantage to this type of embodiment may be the ability to avoidmaking two longitudinal parts constituting a kind of clamp hinged on thepin 24. In some embodiments, the locking means are constituted by anelement that is distinct from the connecting part and that is removabletherefrom. In some embodiments, the locking means co-operate with theconnecting part by screw engagement. It is thus possible to adjustaccurately the dimensions of the ligature-passing passageway(s) asdefined by the connecting part and the rod. In an initial stage, thecoefficient of friction between the coefficient of the ligature andsecondly the rod and the connecting part can be adjusted. In the finalstage, very effective clamping of the ligature is obtained between therod and the locking part.

In some embodiments, including for example the embodiments shown inFIGS. 14-39, rod 18 may not be needed in order for the bone fixingsystem to effectively hold a bone in a relative position. Theembodiments of the bone fixing system 100 shown in FIGS. 14-39 caninclude conformable ligature 14 and blocking body 120, which may includecompression member 140. In these embodiments that do not require the useof rod 18, the conformable ligature 14 may be passed around one or morebones, tendons, muscles, rods, plates, screws, or other structures in abody and passed through loop passage 126 in blocking body 120 to form aloop extending from a first portion of blocking body 120 and a first endand a second end of conformable ligature 14 may be passed out one ormore exit passages 128 in blocking body 120 to extend in a freeconfiguration from a second portion of blocking body 120. Thus, althoughconformable ligature 14 may, in some uses, pass around rod 18 to capturerod 18 in a loop portion, rod 18 is not necessary for bone fixing system100 to hold a bone in a secure position.

With reference to FIGS. 14-38, in embodiments that do not require theuse of rod 18 to hold a structure in a relative position, bone fixingsystem 100 may include compression member 140 having a first surface 146for contact with conformable ligature 14 and for cooperating with insidesurface 125 of blocking body 120 to form a passageway for one or moreends of conformable ligature 14. Compression member 140 may be insertedinto blocking body 120 before conformable ligature 14 is passed throughblocking body 120. In some embodiments, closure member 130 may engagewith engagement portion 123 of blocking body 120 before insertingcompression member 140 and/or passing conformable ligature 14 throughblocking body 120.

In other embodiments that do not require the use of rod 18 to hold astructure in a relative position, bone fixing system 100 may includeclosure member 130 for engagement with engagement portion 123 ofblocking body 120 and for contact with compression member 140 so thatadvancing closure member 130 into blocking body 120 biases compressionmember 140 onto conformable ligature 14. Closure member 130 may beadvanced into blocking body 120 for biasing compression member 140against conformable ligature 14 to create a friction force betweenconformable ligature 14 and blocking body 120. A friction force betweenconformable ligature 14 and blocking body 120 may hold conformableligature 14 in place without significant movement relative to blockingbody 120. In some embodiments, closure member 130 may be advanced intoblocking body 120 for impinging conformable ligature 14 betweencompression member 140 and blocking body 120 to prevent any relativemovement.

Advantageously, the use of compression member 140 in these embodimentsenable bone fixing system 100 to be used in circumstances in which rod18 may be undesirable or unnecessary. Another advantage of theembodiments illustrate in FIGS. 14-38 is the ability for the surgeon tomore easily see conformable ligature 14 as it is passed through variouspassages in the bone fixing system. Another advantage to this embodimentis the reduced size of blocking body 120 over prior art devices thatcouple to a rod. In particular, the use of compression member 140,particularly having a hemispherical profile, can reduce the height andoverall profile of blocking body 120.

FIG. 14 depicts a cross-sectional view of a portion of one embodiment ofbone fixing system 100 useful for holding a bone in a position withoutrequiring rod 18. Bone fixing system 100 of FIG. 14 includes blockingbody 120 with compression member 140 and closure member 130, ligature14, and tensioning tool 250. Blocking body 120 of FIG. 14 includesclosure member passage 123 for receiving closure member 130 and looppassage 126 and exit passages 128 for receiving ligature 14 throughblocking body 120 (e.g., as shown). As shown in FIG. 14, ligature 14 hasbeen passed through blocking body 120 such that each end 14 of ligature14 extends out of one of exit passage 128 and ligature 14 passes throughloop passage 126 to form ligature loop portion. In some embodiments,ligature 14 may have a round profile, which can often provide thehighest strength per unit of cross-sectional area of ligature 14, enablepassing ligature through small openings, and/or reduce the area ofcontact with a structure. As shown in FIG. 14, ligature 14 may have awide, flat (or approximately flat) profile which may distribute forcesover a larger area, provide higher strength, and/or prevent rolling(e.g. as compare to a round profile). Compression member 140 includesfirst surface 146 for cooperating with inner surface 125 of blockingbody 120 to form a passageway between loop passage 126 and exit passages128. As shown in FIG. 14, closure member 130 includes threads 132 forengaging threads 122 in engagement portion 123 of blocking body 120 andbottom surface 135 for contact with compression member 140. As shown inFIG. 14, closure member 130 has been engaged with threads 122 inblocking body 120 and bottom surface 135 contacts compression member 140such that ligature 14 is held in place relative to blocking body 120 dueto compression in the passageways formed by first surface 146 and innersurface 125 between loop passage 126 and exit passages 128. As shown inFIG. 14, bone fixing system 100 includes tensioning tool 250 havingcentral passage 152 for passage of ends 14 of ligature 14 and distal end154 for contact with blocking body 120.

As shown in FIG. 14 (and FIG. 15), blocking body 120 may be manufacturedwith inner surface 125 for cooperating with first surface 146 ofcompression member 140 to form a space through which conformableligature 14 passes and for contacting with a portion of conformableligature 14 to hold conformable ligature 14 in position. In someembodiments, inner surface 125 may be manufactured with a grooved,knurled, or otherwise textured surface to aid in holding conformableligature 14 in place. Inner surface 125 of blocking body 120 may becoated, layered, or otherwise treated to aid in holding conformableligature 14 in place. In some embodiments, inner surface 125 may allowone-way passage of conformable ligature 14 through blocking body 120,for example, by manufacturing inner surface 125 with an asymmetricsaw-tooth profile to allow passage of conformable ligature 14 throughblocking body 120 in a first direction but to resist movement in theopposite direction.

As shown in FIG. 14, loop passage 126 is located along the arclengthopposite (i.e., facing) first surface 146 of compression member 140positioned in blocking body 120, but it should be understood that looppassage 126 could be positioned at other places around blocking body120. As shown in the embodiment of FIG. 14, exit passages 128 arelocated on opposing portions of blocking body 120 and each is locatedhigher than the uppermost portion of compression member 140 whenpositioned in blocking body 120. However it should be understood thatexit passages 128 can be located at other positions around blocking body120. In various embodiments, loop passage 126 and exit passages 128 maybe circular, oval, elliptical, or other shape, may be symmetric orasymmetric, and may be oriented such that conformable ligature 14 mayenter or exit blocking body 120 at an angle, normal, or substantiallytangential to a portion of blocking body 120. In alternativeembodiments, there may only be a single exit passage 128 through whichboth ends 14 of ligature 14 pass.

As shown in FIG. 14, tensioning tool 250 (discussed in further detailbelow) has distal end 154 for detachable engagement with a portion ofblocking body 120. In some embodiments, distal end 154 of longitudinalmember 260 may have passage 152 for accessing closure member 130. Asshown in FIG. 14, distal end 154 may be curved for engagement with aportion of blocking body 120 having a generally curved profile.

In some uses, ligature 14 may have one or both ends passed around astructure in the body. Both ends of ligature 14 may be inserted in looppassage 126 to form a loop around the structures. Compression member 140may be inserted in compression member opening 124. Ligature 14 may bepassed through the passageway formed between first surface 146 ofcompression member 140 and inner surface 125 of blocking body 120. Endsof ligature 14 may be passed out one or more exit passages 128. Closuremember 130 may be inserted in engagement portion 123 to engage threads122. Ends of ligature 14 may be connected to tensioning tool 250, suchas tensioning tool 250 shown in FIG. 39. Ligature 14 may be tightened,and closure member 130 may be inserted in engagement portion 123 andadvanced until closure member 130 contacts compression member 140.Advancing compression member 140 creates a friction force betweenligature 14 and blocking body 120. The friction force may be greatenough to impinge ligature 14 relative to blocking body 120 or may beenough to resist movement of ligature 14 relative to blocking body 120.

FIG. 15 depicts an exploded perspective view of the embodiment ofblocking body 120 shown in FIG. 14, including compression member 140 andclosure member 130. As shown in FIG. 15, blocking body 120 includesengagement portion 123 having threads 122 for receiving closure member130, and compression member opening 124 through which compression member140 may be inserted to “side-load” compression member 140 withinblocking body 120. As shown in the embodiment of FIG. 15, closure member130 includes tool portion 134 and thread 132 and compression member 140includes first surface 146, second surface 145, and flanges 142.

As shown in FIG. 15, blocking body 120 can include compression memberopenings 124 on either side of blocking body 120 for insertion ofcompression member 140. In the embodiment of FIG. 15, compression memberopening 124 has a constant diameter, while in alternative embodimentsopening 124 may have a first diameter large enough to accommodateflanges 142 and a second diameter smaller than flange 142 but largeenough to seat compression member 140. Compression member 140 can beinserted, positioned, and/or removed from blocking body 120. In variousembodiments, compression member 140 may be short enough to fit insideblocking body 120, compression member 140 may be substantially the samelength as blocking body 120, or compression member 140 may extend somedistance beyond blocking body 120. Advantageously, compression member140 enables embodiments of the bone fixing system 100 to operate inareas of the body or in situations in which a rod may be difficult orundesirable. An advantage to blocking body 120 having compression memberopening 124 oriented for side-loading compression member 140 is theability to adjust the positioning of compression member 140 afterclosure member 130 has engaged engagement portion 123.

Extensions 143 (such as flanges 142) of compression member 140 canoperate to prevent compression member 140 from shifting or moving out ofposition once closure member 130 has engaged engagement portion 123 ofblocking body 120. Extensions 143 protrude from the outer surface ofcompression member 140 and are arranged to abut against blocking body120 for maintaining the position of the compression member in theblocking body. In operation, closure member 130 will contact compressionmember 140 to hold ligature 14 substantially in place when ligature 14has been positioned to hold a bone or other structure in a relativeposition. In some embodiments, when compression member 140 has alongitudinal shape along a main axis, extensions 143 may be located nearthe axial ends of compression member 140 and protrude radially from theouter surface of compression member 140. For instance, extension 143 maybe a flange 142, a portion of flange, a pin, etc. In some embodiments,extensions 143 may extend around the entire arclength of first surface146 of compression member 140, such as flanges 142 depicted in FIG. 15,while in other embodiments, extensions 143 may extend around a portionof the arclength of first surface 146. In some embodiments, a radius ofextension 143 may allow insertion or removal of compression member 140in a first orientation and may prevent removal or insertion in a secondorientation. For example, in some embodiments, extensions 143 may have aradius to enable compression member 140 to be inserted into blockingbody 120 when compression member 140 is rotated to a first angle, whilepreventing compression member 140 from being removed when compressionmember 140 is rotated (e.g., 90 degrees) from the first angle. In someembodiments, compression member 140 may have a variable radius.

As shown in the embodiment of FIG. 15, first surface 146 of compressionmember 140 can form a passageway in cooperation with inner surface 125of blocking body 120 for passing ligature 14 and for contactingconformable ligature 14. In some embodiments, first surface 146 may beknurled, grooved, or otherwise machined, may be coated, layered, orotherwise treated for contact with conformable ligature 14, and/or mayallow one-way passage of conformable ligature 14 through compressionmember 140 (e.g., having an asymmetric saw-tooth profile for allowingpassage of conformable ligature 14 past compression member 140 in afirst direction but resisting passage in an opposite direction).

Various mechanisms can be used to allow closure member 130 to engageengagement portion 123 of blocking body 120. In some embodiments,closure member 130 has helically wound thread 132 and can be advanced inblocking body 120 through engagement passage 123 by rotating closuremember 130 to engage threads of engagement portion 123 of blocking body120. In some embodiments, tool portion 134 on closure member 130 can bea hex shaped receiving are that would allow a surgeon to use a hex toolto engage and rotate closure member 130 so that threads 132 engage withthe threads of engagement portion 123. In some embodiments, closuremember 130 may have a sawtooth profile or other profile for ratchetingclosure member 130 into blocking body 120. Those of ordinary skill inthe art will recognize a variety of other mechanisms (some of which willbe described herein) for engaging closure member 130 with engagementportion 123 in order to enable closure member 130 to contact compressionmember 140 and secure in place ligature 14.

Advantages to embodiments of bone fixing systems 100 such as the onedepicted in FIGS. 14 and 15 include the curved profile of blocking body120, which can result in an overall lower profile and/or in less stresson surrounding tissue based on friction contact.

FIG. 16 depicts a perspective view of an alternative embodiment ofcompression member 140 of FIGS. 14 and 15 having longitudinal slot 144and stress reducer 148. In some embodiments, compression member 140 mayhave a length and width such that when compression member 140 ispositioned inside blocking body 120, first surface 146 is in contactwith inner surface 125 of blocking body 120 (or first surface 146 is incontact with conformable ligature 14 which is in contact with innersurface 125 of blocking body 120, for example as shown in FIG. 14). Invarious embodiments, compressing on second surface 145 may bias firstsurface 146 against inner surface 125 and the radius of curvature offirst surface 146 may effectively change some amount, based at least inpart on the length and depth of longitudinal slot 144. One advantage tocompression member 140 having longitudinal slot 144 is the capability toadjust the compressive force exerted by compression member 140 onligature 14. In addition to the length and depth of longitudinal slot144, the amount that the radius of curvature can change can depend onthe compression force applied to second surface 147, the shape of innersurface 125, the deformability of any coating, layer, a machined featureof inner surface 125 or first surface 146, the thickness of conformableligature 14, or the original shape of first surface 146. As shown in theembodiment of FIG. 16, longitudinal slot 144 can include stress reducer148, which can advantageously prevent or reduce the likelihood ofcompression member 140 cracking or other material failure due to achange in curvature of first surface 146. While other shapes can beemployed, stress reducer 148 may be generally circular or othernon-angular shape to prevent the build-up of stresses associated withbending forces. The radius and position of stress reducer 148 may bebased on the material used for compression member 140, the radius ofcurvature of first surface 146, the depth and width of longitudinal slot144, the anticipated compression force applied to second surface 147, orthe length of compression member 140.

FIGS. 17-19 illustrate another embodiment of the bone fixing system 100.FIG. 19 is a perspective view of this embodiment of blocking body 120,in which compression member 140 and closure member 130 may be top-loadedor side-loaded into blocking body 120 via U-shaped channel 127. In thisembodiment, blocking body 120 is shown to include two upwardly extendingwalls forming a generally U-shaped channel 127. Compression member 140is shown with a similar “dual cylinder” shape as the compression member140 of FIG. 16 (in fact, the compression member of FIG. 16 can be usedin the FIG. 17 embodiment) with first surface 146 and flanges 142. Asshown in FIG. 18, compression member 140 may extend some distance beyondblocking body 120 with extensions 143 on compression member 140 designedto prevent compression member 140 from moving laterally once compressionmember 140 is positioned in blocking body 120. As shown in the FIG. 18embodiment, extensions 143 may be located exterior to blocking body 120(while in alternative embodiments, extensions 143 may be locatedinterior to blocking body 120).

Compression member 140 can be placed within channel 127 with surface 146contacting inner wall 125 at the bottom of channel 127. Closure member130 may be inserted into channel 127 (e.g., by engaging the exteriorthreads on the body of closure member 130 with the interior threads 122of channel 127) for engaging engagement portion 123. Advancing closuremember 130 down channel 127 (e.g., rotating closure member 130) canforce compression member 140 against ligature 14 to hold ligature 14 inplace without significant movement (or with complete impingement)relative to blocking body 120.

FIG. 17 shows a cross-sectional view of this embodiment of bone fixingsystem 100 using the blocking body 120 of FIG. 19 in which compressionmember 140 is either side or top-loaded into blocking body 120. As shownin FIG. 17, conformable ligature 14 may be passed through loop passage126 in blocking body 120 to form a loop extending from blocking body 120and first and second ends may be passed out one or more exit passages128 to extend from a second portion of blocking body 120. In order touse the bone fixing system 100 to hold a bone in position, compressionmember 140 may be inserted in blocking body 120 after conformableligature 14 has been passed through blocking body 120. Closure member130 may be engaged to engagement portion 123 of blocking body 120 afterconformable ligature 14 has been passed through blocking body 120 andafter compression member 140 has been positioned in blocking body 120.Engaging closure member 130 in engagement portion 123 of blocking body120 prevents all or significant movement of conformable ligature 14relative to blocking body 120.

As shown in FIG. 17, exit passages 128 can be positioned higher thanfirst surface 146 of compression member 140 in order to provide a longerpassage between first surface 146 of compression member 140 and innersurface 125 of blocking body 120 to provide a higher frictioncoefficient or reduced point stresses on conformable ligature 14,blocking body 120, and/or compression member 140. In alternativeembodiments, exit passages 128 may be positioned near engagement portion123 such that closure member 130 may contact conformable ligature 14. Invarious embodiments, closure member 130 may impinge a portion ofconformable ligature 14. As shown in FIG. 17, exit passages 128 may belocated on blocking body 120 such that when distal end 154 of tensioningtool 250 engages blocking body 120, first and second ends of ligature 14are external of distal end 154. However, it should be understood thatexit passages 128 may be located at a number of locations on theblocking body 120 and relative to tensioning tool 250. Distal end 154 oftensioning tool 250 may engage a portion of blocking body 120 to enablea surgeon to tension conformable ligature 14 in order to hold a bone orstructure in position. In various embodiments, distal end 154 oftensioning tool 250 may be flanged for engaging blocking body 120.Tensioning tool 250 may include passage 152 along the entire length oftensioning tool 250 for accessing closure member 130 or passage 152 mayextend a selected length of tensioning tool 250.

FIG. 18 depicts a side view of this embodiment of bone fixing system 100where conformable ligature 14 passes through loop passage 126 to form aloop extending from a first portion of blocking body 120, and furtherpasses through a passage formed by compression member 140 and blockingbody 120, and passes out both exit passages 128 (though ligature 14could in various embodiments pass both ends through a single exitpassage 128). FIG. 18 illustrates the flanges 142 extending outside ofblocking body 120.

As described, closure member 130 may be top-loaded into blocking body120 for the embodiments of FIGS. 17-19. One advantage to top-loadingclosure member 130 and compression member 140 is that closure member 130may be integrated with compression member 140 to form a unitary piece,which reduces the number of components that the surgeon has to implantduring surgery. In various embodiments, closure member 130 may beconnected to compression member 140 by a pin (not shown) to form aunitary piece. In some embodiments, closure member 130 may rotate whilecompression member 140 does not rotate. One advantage to this unitaryclosure member/compression member embodiment is that compression member140 may apply only compression forces to ligature 14. In contrast, ifcompression member 140 rotates inside blocking body 120, torsion may beapplied to ligature 14.

FIGS. 20-22 depict yet another embodiment of bone fixing system 100 inwhich conformable ligature may be passed around one or more bones,tendons, muscles, rods, plates, screws, or other structures in the body,and then passed through loop passage 126 in blocking body 120 to form aloop extending from a first portion of blocking body 120. Ligature 14can then be passed through a passageway formed by first surface 146 ofcompression member 140 and inner surface 125 of blocking body 120, andpassed out through the center of blocking body 120 to extend out ofblocking body 120 so that ends 14 of ligature 14 can be in a freeconfiguration. Tensioning tool 250 may have a central passage 152 toallow first end and second end of ligature 14 to pass through.

FIG. 21 depicts a side view of a portion of one embodiment of blockingbody 120, in which compression member 140 may be side-loaded throughcompression member opening 124 into blocking body 120. As shown,blocking body 120 of FIG. 21 has a similar shape to the blocking body120 of FIG. 19, except that the FIG. 21 embodiment of blocking body 120encloses compression member 140 (as opposed to the “open” top of theblocking body 120 of FIG. 19). Thus, in the FIG. 21 embodiment,compression member 140 may be pre-loaded into blocking body 120 or evenmanufactured to be permanently enclosed within blocking body 120. In analternative embodiment, compression member 140 and/or extensions 143 maybe manufactured with dimensions such that once compression member 140 isinserted in blocking body 120, the position of compression member 140may be altered but compression member 140 may not be removed fromblocking body 120. In other words, in the embodiment shown in FIG. 21,compression member 140 may be moved around inside blocking body 120, butmay not be removed. In various embodiments, blocking body 120 may bemanufactured with compression member opening 124 having a first set ofdimensions and after compression member 140 is inserted into blockingbody 120 through opening 124, the size of opening 124 may be altered(e.g., by adding material or altering the shape of blocking body 120 atopening 124) to reduce opening 124 dimension to prevent removal ofcompression member 140. Alternatively, compression member 140 may bemanufactured having a first set of dimensions, inserted into opening 124of blocking body 120, and then altered, such as by adding material, toincrease the dimensions of compression member 140 to prevent removal ofcompression member 140. In various embodiments, compression member 140may be compression fit or sweat-locked through opening 124 into blockingbody 120. In another embodiment, blocking body 120 may be manufacturedwith two upwardly extending walls, compression member 140 may beinserted in a channel formed by the two walls, and material may be addedto convert the channel into opening 124.

FIG. 22 depicts an exploded perspective view of the embodiment ofblocking body 120 of FIGS. 20 and 21 in which compression member 140 maybe side-loaded into blocking body 120 and closure member 130 maythreadably engage engagement portion 123 of blocking body 120. A toolmay engage with tool portion 134 for rotating closure member 130 toengage external threads 132 on closure member 130 with internal threads122 in blocking body 120. Tool portion 134 of closure 130 can be hollowto enable one or more ends of conformable ligature 14 to pass throughand extend out exit passage 128.

FIGS. 23-25 show another embodiment of a bone fixing system 100 havingan alternate closure mechanism and exit passage. FIG. 23 depicts a crosssectional end view of bone fixing system 100 in which conformableligature 14 may be passed through loop passage 126 in blocking body 120to form a loop extending from a first portion of blocking body 120,through a passage formed by first surface 146 of compression member 140and inner surface 125 of blocking body 120, and extend out through exitpassage 128. As shown in FIGS. 23 and 25, in this embodiment, ring-styleclosure member 130 may have internal threads 132 for engaging externalthreads 122 on blocking body 120. This type of embodiment will providethe advantage of allowing the surgeon to see conformable ligature 14 asit passes through loop passage 126 in blocking body 120 and to seecompression member 140 as it is positioned in blocking body 120.

FIG. 24 depicts a side view of the FIG. 23 embodiment in which bottomsurface 135 of closure member 130 is in contact with second surface 145of compression member external to blocking body 120, and in thisembodiment bottom surface 135 of closure member 130 contacts secondsurface 145 at extensions 143 of compression member 140. An advantage tothis type of embodiment is the ability for the surgeon to see theengagement between threads 132 on closure member 130 with threads 122 onblocking body 120. As shown in FIG. 24, tool portions 134 of closuremember 130 may be positioned on an exterior portion of closure member130. An advantage to this type of embodiment is the ability for a tool(not shown) to engage tool portions 134 exterior to distal end 154 (notshown) engaged with a portion of blocking body 120. This exteriorengagement can provide a superior tightening mechanism to engage closuremember 130 with blocking body 120 in certain embodiments.

FIG. 25 depicts an exploded perspective view of the FIG. 24 view withthe various portions of blocking body 120 separated prior to engagementof closure member 130 onto blocking body 120. An advantage to thisembodiment is the reduced number of passages, which may reduce the timeneeded to implant the system.

FIGS. 26-28 illustrate an alternative embodiment of bone fixing system100 that provides a hinged closing mechanism offset from ligature 14that also does not require a rod, and which can provide certainadvantages over other embodiments. FIG. 26 shows blocking body 120 withfirst portion 170 hingedly connected via hinge pin 178 to second portion180. Compression member 140 is an integral part of second portion 180and is located on the side of second portion 180 directed towards firstportion 170. In alternative embodiments, compression member 140 is anintegral part of first portion 170 and is located on the side of firstportion 170 directed towards second portion 180. Conformable ligature 14can pass through loop passage 126 in first portion 180 of blocking body120 to form a loop extending from first portion 180 of blocking body120, further passed through a passage formed between first surface 146of compression member 140 and inner surface 125 of blocking body 120,and then passed through exit passage 128 in second portion 170. As withevery embodiment described, ligature 14 may get to this desiredconfiguration (with a loop portion extending from blocking body 120) ina variety of ways. An advantage to this embodiment is the low profilepossible due to the configuration of closure member 130 offset fromcompression member 140.

In various embodiments, hinge pin 178 connects first portion 170 tosecond portion 180 in either a permanent manner or alternatively thehinged connection may be disconnectable. The hinged connection can beformed so as to allow two-way hinged motion for engaging or disengagingfirst portion 170 from second portion 180. In an alternative embodiment,the hinged connection may allow one-way hinged motion for engaging firstportion 170 from second portion 180 but may subsequently prevent firstportion 170 from disengaging second portion 180. In various embodiments,first portion 170 and/or second portion 180 may allow hinged motionbetween a selected arclength, for example, first portion 170 and secondportion 180 may move through an arc of approximately 180 degrees.

As further shown in FIGS. 26-28, closure member 130 will be used toclose the hinged bone fixing system 100 in a manner to hold ligature 14in a relatively or completely stable position relative to blocking body120. Closure member 130 of FIG. 27 is shown having external threads 132for engaging internal threads 122 in engagement portion 123 of blockingbody 120. Second portion 180 may include engagement portion 122 forengagement by threads 132 on closure member 130. In one embodiment,closure member 130 may be positioned within first portion 170 such thatclosure member 130 is free to rotate in first portion 170 to join firstportion 170 with second portion 180, but may not be removed from firstportion 170 after such engagement. In other words, in some embodiments,closure member 130 may be rotated to engage threads on closure member130 with engagement portion 123 to collapse first portion 170 and secondportion 180, and the direction of rotation may be reversed to disengageclosure member 130 from engagement portion 123, but closure member 130may not be removed from first portion 170. In the embodiment shown inFIG. 26, closure member 130 can be rotatably positioned in secondportion 180 such that closure member 130 is free to rotate in secondportion 180 but may not be removed from second portion 180, which canprovide the advantage of reducing the risk of having loose hardware(which can be lost inside a patient during surgery) associated with bonefixing system 100.

FIG. 27 depicts a cross-sectional side view of a portion of theembodiment of bone fixing system 100 depicted in FIG. 26, in whichconformable ligature 14 may be passed through loop passage 126 in firstportion 170 to form a loop extending from first portion 170 of blockingbody 120, passed through a passage formed by first surface 146 ofcompression member 140 and inner surface 125 of blocking body 120, andextend from exit passage 128 in second portion 180. As shown in FIG. 27,first portion 170 and second portion 180 rotate about hinge pin 178 toopen or close blocking body 120. Tool portion 134 on closure member 130may be rotated so threads 132 on closure member 130 engage threads 122in engagement portion 123. Once bottom surface 135 of closure member 130reaches a selected point, first portion 170 and second portion 180compress to impinge movement of ligature 14 relative to blocking body120.

First surface 146 of compression member 140 and inner surface 125 ofblocking body 120 provide a passageway through blocking body 120. Insome embodiments, inner surface 125 may be located on first surface 170and first surface 146 of compression member 140 may be located on secondportion 180 as depicted in FIG. 27. In some embodiments, inner surface125 may be located on second surface 180 and first surface 146 ofcompression member 140 may be located on first portion 170.

Closure member 130 may be offset from compression member 140 such thatthreaded engagement of threads 132 of closure member 130 with engagementportion 123 of blocking body 120 may indirectly apply compression tocompression member 130. In other words, compression member 140 may bepositioned some distance L_(b) from hinge pin 178 and closure member 130may be positioned some distance L_(s) from hinge pin 178. Compression ofcompression member 140 onto conformable ligature 14 may not beaccomplished by directly contacting bottom surface 135 of closure member130, but may instead be accomplished by rotatably engaging threads 132with threads 122 to advance closure member 130 in blocking body 120 suchthat second portion 180 may be leveraged around the fulcrum created byhinge pin 178. An advantage to one embodiment uses the mechanicaladvantage of L_(s)/L_(b) to apply compression forces on conformableligature 14. Another advantage to one embodiment is the ability for thesurgeon to apply large compression forces to conformable ligature 14 dueto the mechanical advantage based on the position of hinge pin 178,compression member 140, and closure member 130. The compression forcesavailable may also be based on the radius of curvature of compressionmember 140, the size or pitch of threads 132 and 122, and/or the size ofhinge pin 178. Another advantage may be the precision in which afriction coefficient may be selected between conformable ligature 14 andblocking body 120. In some embodiments, the pitch, shank diameter, orother dimensions of closure member 130 may enable control of theapplication of compression. For example, a large number of threads perinch may allow more compression due to the mechanical advantage ofthreads 122 engaging with threads 132, and the application may be morecontrolled due to the greater angular rotation needed to advance closuremember 130 the same distance as closure members 130 having lower numbersof threads per inch. Another advantage to this embodiment relates to theouter surface of first portion 170 and/or second portion 180. Becauseblocking body 120 can achieve a mechanical advantage through the use ofhinge pin 178, closure member 130 may be made smaller than prior artapproaches, which allows blocking body 120 to have a smaller opening123. As shown in FIG. 27, second portion 180 has an outer surface thatis curved, which may reduce pain, discomfort, or other undesirableeffects that result from using an angular implant.

FIG. 28 depicts a perspective view of the embodiment of FIGS. 26 and 27shown in a closed configuration, where ligature 14 is held completely orsubstantially in place relative to blocking body 120. One advantage tothis type of embodiment may be the ability to pass conformable ligature14 around one or more bones, tendons, muscles, rods, plates, screws, orother structures in the body, pass conformable ligature 14 throughblocking body 120 out a single exit passage 128, and engage closuremember 130 on blocking body 120, but offset from conformable ligature 14and/or compression member 140. One advantage may be that tensioning tool250 may not need passage 152 in distal end 154 because closure member130 (e.g., tool portions 134) may be accessed outside tensioning tool250.

It should be understood that the various closure mechanisms, closuremembers, exit passages, and blocking bodies, and other design featuresshown in the various embodiments of bone fixing system 100 of FIGS.14-28 may potentially be used in the other embodiments of FIGS. 14-28.For example, the ring-style closure member 130 of the FIG. 25 embodimentcan be used on the embodiment of FIG. 22 by modifying the blocking bodyof FIG. 22 to have external threads onto which the internal threads ofthe ring-style closure member 130 would engage.

FIGS. 29-38 depict embodiments of bone fixing system 100 in variousconfigurations, arrangements and orientations. In FIGS. 29-38, theembodiment of blocking body 120 is the embodiment depicted in FIGS.26-28. However, any of the embodiments depicted in FIGS. 14-28 andvariations may be used without departing in scope from the presentdisclosure.

FIG. 29 depicts a perspective view of one embodiment of bone fixingsystem 100 for holding a bone in a position. Bone fixing system 100 maybe useful for orthopedic applications, such as holding a bone near atendon or muscle. Portions 214 of conformable ligature 14 may be passedthrough or around a portion of a muscle and through or around a portionof a femur to provide support while a tear or cut in the muscle heals.Advantageously, blocking body 120 may be positioned at various locationsnear the muscle, tendon, or bone based on the type or extent of theinjury, trauma, or illness, surgical preferences such as MIS access, orpatient health such as age or weight, or the like. Advantageously,embodiments of bone fixing system 100 may be implanted near othersurgical implants without affecting their placement or function. Invarious embodiments, bone fixing system 100 may include blocking body120 indirectly applying tension to conformable ligature 14. For example,in the embodiment depicted in FIG. 29, bone fixing system 100 may beimplanted to maintain bone 219 in a position with muscle 209 while wound211 heals. In this embodiment, conformable ligature 14 may be passedaround bone 219 and through muscle 209, and through blocking body 120located on portion 112 of conformable ligature 14 such thatsubstantially all tension between muscle 209 and bone 219 may besupported by portion 111 of conformable ligature 14.

Bone fixing systems 100 may be implanted without affecting plates, rods,or other implanted structures. Bone fixing systems may be implantedwithout affecting bone screws, hooks, bolts, or other implantedhardware. FIG. 30 depicts one embodiment of conformable ligature 14passed around a part of bone 219, muscle 209 and/or tendon 213 andthrough blocking body 120, and further depicts bone screw 212 and plate210 implanted on a portion of bone 219. In this type of embodiment, bonefixing system 100 including blocking body 120 may be positioned onportion 111 of conformable ligature 14 such that some of the tensionbetween muscle 209 and bone 219 may be supported by blocking body 120.

Bone fixing system 100 may be advantageous for correcting alignment ofone or more bones. Conformable ligatures 14 and blocking bodies 120 maybe useful for correcting alignment of a portion of the spine. FIGS. 31and 32 depict posterior and sagittal views of a portion of the spine inwhich bone fixing system 100 may be useful for aligning vertebra L5 withadjacent vertebrae L4 and sacrum S. In some embodiments, bone fastenerassemblies 212 may be implanted in lumbar vertebra L4 and sacrum S. Insome embodiments, bone fastener assemblies 212 may be inserted throughan incision in the skin and implanted using Minimally Invasive Surgery(MIS) techniques, rods 210 may be connected to bone fastener assemblies212, and ligature 14 may be passed around rods 210. Also shown in FIGS.31 and 32, ligature 14 may be passed around rods 210 and vertebra suchas L5. An advantage to bone fixing system 100 is that the placement ofblocking body 120 may not depend on the availability of rod 210. Forexample, in FIG. 32, the placement of blocking body 120 is not directlyover vertebra L5.

In some embodiments, passing may include going into, through, or out ofa structure. In some embodiments, passing may include going over, under,or around a structure. In some embodiments, passing may include crossingover other ligatures 14 or portions of ligatures 14. In someembodiments, passing may include multiple passes along the same path.FIGS. 33-38 depict various embodiments of bone fixing systems in placeon a portion of a spine. In FIGS. 33-38, bone fixing system 100 is shownholding bone graft 230, which may be useful for supporting a portion ofthe spine. However, embodiments of bone fixing system 100 may be used tocorrect problems with the spine without rods, bone grafts, plates, orother implants. Conformable ligature 14 may be passed around a portionof a bone, such as spinous process SP. Conformable ligature 14 may bepassed around a portion of bone graft 230. Passing conformable ligature14 around a portion of bone graft 230 may include passing a portion ofconformable ligature 14 through a portion of bone graft 230. One end ofconformable ligature 14 may be inserted and passed through blocking body120 from one side and the other end of conformable ligature 14 may beinserted and passed through blocking body 120 from another side, asdepicted in FIG. 33.

Advantageously, conformable ligature 14 may be selectively passed aroundstructures such as bones and bone grafts. Conformable ligature 14 may bepassed around a bone, bone graft, tendon, or other tissue due todisease, injury, tumor, degenerative effects or the like. For example,FIG. 33 depicts a posterior view of one embodiment in which conformableligature 14 may be passed around a portion of spinous process SP onlower vertebra L5. FIG. 33 further depicts one embodiment in whichconformable ligature may be passed through bone, such as the pedicle oflower vertebra L5. As another example, FIG. 34 depicts a sagittal viewof one embodiment in which conformable ligature 14 may be passed aroundthe posterior portion of spinous process SP. As another example, FIG. 35depicts a posterior view of one embodiment in which conformable ligature14 may be passed around a portion of the pedicle portion of lowervertebra L5. As another example, FIG. 36 depicts a sagittal view of oneembodiment in which conformable ligature 14 may be passed around thepedicle portion and the posterior portion of spinous process SP. In someembodiments, ligature 14 may not be passed around a structure. FIG. 37depicts a posterior view of one embodiment in which conformable ligature14 may be passed around a portion of the pedicle portion of lowervertebra L5 and the transverse process of upper vertebra L4 but not thespinous process for either vertebra. FIG. 38 depicts a sagittal view ofone embodiment in which conformable ligature 14 may be passed around thepedicle portion and through the posterior portion of spinous process SPon lower vertebra L5.

In some embodiments, the surgeon may pass conformable ligature 14alternative ways due to disease, injury, tumor, degenerative effects orthe like. For example, FIG. 33 depicts a posterior view of oneembodiment in which conformable ligature 14 may be passed through aportion of the pedicle of lower vertebra L5, which may allow system 100to apply direct tension on lower vertebra L5. As another example, FIG.34 depicts a sagittal view of one embodiment in which conformableligature 14 may be passed around bone graft 230 and spinous process SPon lower vertebra L5 such that the lower portion of bone graft 230 maybe prevented from moving posterior to the spine but may move anterior tothe spine. FIG. 35 depicts a posterior view of one embodiment in whichconformable ligature 14 may be passed around a portion of the pedicleportion of lower vertebra L5, which may allow system 100 to indirectlyapply tension on lower vertebra L5. FIG. 36 depicts a sagittal view ofone embodiment in which conformable ligature 14 may be passed aroundbone graft 230 and spinous process SP on lower vertebra L5 such that thelower portion of bone graft 230 may be prevented from moving posterioror anterior to the spine. FIG. 37 depicts a posterior view of oneembodiment in which first and second conformable ligatures 110 may bepassed around a portion of the pedicle portion of lower vertebra L5.Advantageously, the system 100 may be able to selectively apply tensionto either side of the spine. Furthermore, system 100 may be able tocontrol movement between vertebrae L4 and L5 similarly to theembodiments depicted in FIGS. 33 and 34, but without contacting thespinous process SP of lower vertebra L5. FIG. 38 depicts a sagittal viewof one embodiment in which conformable ligature 14 may be passed aroundthe pedicle portion and through the posterior portion of spinous processSP on lower vertebra L5. Advantageously, vertebrae L4 and L5 may be ableto move relative to each other but bone graft 230 may be held in place.

An advantage to bone fixing system 100 is that the position of blockingbody 120 may be based on disease, injury, tumor, degenerative effects orthe like. For example, FIG. 33 depicts one embodiment in which a singleblocking body 120 may be positioned off-center of the spine. As anotherexample, FIG. 34 depicts one embodiment in which blocking body 120 maybe positioned abutting a bone such as spinous process SP. FIG. 35depicts one embodiment in which blocking body 120 may be positionedcentered on the midline of the spine. FIG. 36 depicts one embodiment inwhich blocking body 120 may be positioned some distance away fromspinous process SP. FIG. 37 depicts one embodiment in which two blockingbodies 120 may be positioned lateral to bone graft 230. FIG. 38 depictsone embodiment in which blocking body 120 may be positioned centeredbetween spinous processes SP.

Two or more conformable ligatures 14 and/or two or more blocking bodies120 may be used to hold a bone, bone graft, tendon, rod, shaft, or otherstructure in a body. FIG. 36 depicts a posterior view and FIG. 37depicts a sagittal view of one embodiment of a bone fixing system havingtwo blocking bodies 120 and 120′ and two conformable ligatures 14 and14′. In some embodiments, bone fixing system 100 may include a firstconformable ligature 14 passed around a bone such as transverse processTP on lumbar vertebra L4 and transverse process TP on lumbar vertebraL5, and a second conformable ligature 14′ passed around a bone such astransverse process TP on lumbar vertebra L4 and transverse process TP onlumbar vertebra L5. Bone fixing system 100 with a first blocking body120 on a first side of the spine and a second blocking body 120′ on thesecond side of the spine may be used to straighten a spine. For example,tensioning one conformable ligature 14 greater than conformable ligature14′ may bias vertebrae to help straighten a curved spine.

FIG. 39 depicts a side view of a portion of one embodiment of tensioningtool 250, which may be used to apply tension to conformable ligature 14.As shown in FIG. 39, tensioning tool 250 includes tool body 266 forengaging conformable ligature 14, longitudinal member 260 foradvancement in tool body 266, and distal end (such as distal end 154depicted in FIGS. 14, 17, and 20) for engagement with blocking body 120.As shown in FIG. 39, tool body 266 includes attachment point 274 (withflange 258) for connection to ligature 14, fixed handle 254, movablehandle 252 for rotation about axis 256, return spring 262, catchmechanism 264, return spring adjustment member 270, and springadjustment member 268.

Attachment point 274 can attach first and second ends of conformableligature 14 to tensioning tool 250. In some embodiments, attachmentpoint 274 may include flange 258 for preventing first and second ends ofconformable ligature 14 from detaching from tensioning tool 250. Distalend 154 (such as the embodiments shown in FIGS. 14, 17, and 20) oftensioning tool 250 may engage to a portion of blocking body 120. Fixedhandle 254 may be gripped by a surgeon, movable handle 252 may berotated about axis 256, such as by squeezing movable handle 252, tolongitudinal member 260 through tool body 266 a selected distance.Advancing longitudinal member 260 to move blocking body 120 away fromtool body 266 while maintaining first and second ends of conformableligature 14 on attachment point 274 applies tension to conformableligature 14. In some embodiments, the selected distance longitudinalmember 260 advances through tool body 266 may be proportional to thetension applied to conformable member 110.

In some embodiments, tool body 266 may include return spring 262, catchmechanism 264, and return spring adjustment member 270 for controllingthe distance that longitudinal member 260 is allowed to return whenmovable handle 252 is released. In some embodiments, return spring 262may bias catch mechanism 264 such that movement is permitted in onedirection only. In some embodiments, return spring 262 may bias catchmechanism 264 such that longitudinal member 260 may only move forwardthrough tool body 266. Advantageously, return spring 262 may ensure thata surgeon does not inadvertently relieve tension from conformableligature 14. In other words, tensioning tool 250 may have a defaultconfiguration for tensioning conformable ligature 14. In someembodiments, actuating catch mechanism 264 (such as a surgeon pressingon catch mechanism 264 with a thumb) may change the positioning of catchmechanism 264 such that movement of longitudinal member 260 is permittedin a reverse direction as well. In some embodiments, movement oflongitudinal member 260 in a reverse direction may include changing thepositioning of catch mechanism 264 in relation to longitudinal member260 as well as pulling in a reverse direction on grasping member 272.

In some embodiments, tensioning tool 250 may include spring adjustmentmember 268 for adjusting the compression on a spring (not shown) in body266. In some embodiments, rotating spring adjustment member 268 onedirection, spring adjustment member 268 may be advanced some distanceinto body 266 such that a spring may be compressed. In some embodiments,rotating spring adjustment member 268 in the other direction, springadjustment member 268 may be advanced some distance out of body 266 suchthat compression forces on the spring may be relieved. By changing thecompression forces on the spring, the spring may exert more or lessforce on longitudinal member 260, which may affect how much tension canbe applied to the ends of conformable ligature 14.

In some embodiments, ligature 14 may be passed around elongate members210, bone fastener assemblies 212, vertebrae (such as L5), and othertendons, muscles, plates or other anatomical or implanted structures andthe ends of ligature 14 may be passed into a portion of blocking body120, such that a loop is formed extending from a first portion ofblocking body 120. In some embodiments, first and second ends ofligature 14 may be passed through a passage in blocking body 120. Insome embodiments, a passage may be formed by inner surface 125 ofblocking body 120 and first surface 146 of compression member 140. Insome embodiments, first and second ends of ligature 14 may exit bypassing out of one or more exit passages 128 in blocking body 120.

Distal end 154 of tensioning tool 250 engages blocking body 120. In someembodiments, distal end 154 of longitudinal member 260 may conform tothe shape or profile of blocking body 120. In some embodiments, distalend 154 of longitudinal member 260 may be configured with features forengaging one or more features on blocking body 120. In some embodiments,first and/or second ends of ligature 14 may be attached to tensioningtool 250. In some embodiments, first and/or second ends of ligature 14may be attached to attachment point 274 located on tool body 266. Insome embodiments, movable handle 252 of tensioning tool 250 may berotated about axis 256 to advance longitudinal member 260 through toolbody 266. The advancement of longitudinal member 260 through tensioningtool 250 moves attachment point 274 away from blocking body 120, pullingends of ligature 14 to decrease the size of the loop, and furtheradvancement tensions ligature 14. In some embodiments, the tensionapplied to ligature 14 may be sufficient to hold one or more structuresin a desired position. In some embodiments, the tension applied toligature 14 may be sufficient to hold a bone in a position. In someembodiments, the tension applied to ligature 14 may be sufficient topull one or more bones or structures into alignment. For example,tensioning tool 250 may provide sufficient tension to one or more endsof ligatures 14 (depicted in FIG. 31) to pull vertebra L5 (depicted inFIG. 32) in alignment with the natural curvature of the spine.

In some embodiments, once an appropriate tension has been applied toligature 14, closure member 130 may be actuated to create a frictionforce to restrict movement of ligature 14 relative to blocking body 120,or to impinge ligature 14 in blocking body 120. In some embodiments,closure member 130 may be pre-installed in blocking body 120. In someembodiments, closure member 130 may be inserted in blocking body 120after engagement of blocking body 120 by tensioning tool 250. In someembodiments, closure member 130 may be inserted through distal end 154of longitudinal member 260 into blocking body 120.

In some embodiments, once closure member 130 has engaged threads 122 inblocking body 120 to provide a desired friction force to impingeligature 14 in blocking body 120, first and second ends of ligature 14may be disconnected from tensioning tool 250. Once ligature 14 has beendisconnected from tensioning tool 250, tensioning tool 250 may bedisengaged from blocking body 120.

The foregoing specification and accompanying figures are for the purposeof teaching those skilled in the art the manner of carrying out thedisclosure and should be regarded in an illustrative rather than arestrictive sense. As one skilled in the art can appreciate, embodimentsdisclosed herein can be modified or otherwise implemented in many wayswithout departing from the spirit and scope of the disclosure and allsuch modifications and implementations are intended to be includedwithin the scope of the disclosure as set forth in the claims below.

1. A bone fixing assembly, comprising: a flexible ligature having afirst end portion, a second end portion, and a loop portion extendingbetween the first end portion and the second end portion configured tobe passed around a bone structure; and a clamping assembly for securingthe flexible ligature around the bone structure in a tensioned statewithout securing the ligature against a rod, the clamping assemblyincluding a body having a passage extending therethrough from a firstopening to a second opening, and a threaded closure member configured tothreadably engage a threaded bore of the body; wherein the first endportion of the flexible ligature extends through the passage between thefirst opening and the second opening, and the second end portion of theflexible ligature extends through the passage between the first openingand the second opening, with the looped portion extending from the firstopening of the body; and wherein the first end portion of the flexibleligature within the body is pressed against the second end portion ofthe flexible ligature within the body to secure the first and second endportions of the flexible ligature in the clamping assembly throughrotation of the threaded closure member in the threaded bore of thebody.
 2. The bone fixing assembly of claim 1, wherein the clampingassembly further includes a compression member movably assembled withthe body.
 3. The bone fixing assembly of claim 2, wherein thecompression member is hingedly attached to the body.
 4. The bone fixingassembly of claim 2, wherein the threaded closure member presses againsta surface of the compression member.
 5. The bone fixing assembly ofclaim 2, wherein the threaded closure member indirectly exerts asecuring force against the first and second end portions of the flexibleligature through the compression member.
 6. A bone fixing assembly,comprising: a flexible ligature having a first end and a second end, theflexible ligature configured to be passed around a bone structure; and aclamping assembly for securing the flexible ligature around the bonestructure in a tensioned state, the clamping assembly including: a bodyhaving a first passage therethrough from a first opening of the body toa second opening of the body and a second passage therethrough from thefirst opening of the body to a third opening of the body; and acompression member; wherein a first portion of the flexible ligatureextends through the first passage of the body from the first opening tothe second opening and a second portion of the flexible ligature extendsthrough the second passage of the body from the first opening to thethird opening; and wherein the compression member is configured to pressagainst the first and second portions of the flexible ligature to securethe first and second portions of the flexible ligature in the first andsecond passages, respectively.
 7. The bone fixing assembly of claim 6,wherein the clamping assembly is configured to secure the flexibleligature around the bone structure in a tensioned state without securingthe clamping assembly to a rod.
 8. The bone fixing assembly of claim 6,wherein the clamping assembly further includes a threaded closure memberthreadably engaging threads of the body to press the compression memberagainst the first and second portions of the flexible ligature.
 9. Thebone fixing assembly of claim 8, wherein the threaded closure memberpresses against a surface of the compression member.
 10. The bone fixingassembly of claim 6, wherein a central looped portion of the flexibleligature is located between the first portion and the second portion ofthe flexible ligature.
 11. The bone fixing assembly of claim 10, whereinthe looped portion is configured to extend around the bone structure.12. The bone fixing assembly of claim 11, wherein the looped portionextends from the first opening of the body.
 13. A bone fixing assembly,comprising: a flexible ligature having a first end and a second end, theflexible ligature configured to be passed around a bone structure; and aclamping assembly for securing the flexible ligature around the bonestructure in a tensioned state without securing the flexible ligatureagainst a rod, the clamping assembly including a body, a compressionmember movably assembled with the blocking body, and a threaded closuremember configured to threadably engage threads of the body; wherein afirst portion of the flexible ligature extends through the clampingassembly between the body and the compression member, and a secondportion of the flexible ligature extends through the clamping assemblybetween the body and the compression member; and wherein the threadedclosure member is configured to press the compression member against thefirst and second portions of the flexible ligature to secure the firstand second portions of the flexible ligature in the clamping assembly.14. The bone fixing assembly of claim 13, wherein the threaded closuremember presses against a surface of the compression member.
 15. The bonefixing assembly of claim 13, wherein a central looped portion of theflexible ligature is located between the first portion and the secondportion of the flexible ligature.
 16. The bone fixing assembly of claim15, wherein the looped portion is configured to extend around the bonestructure.
 17. The bone fixing assembly of claim 13, wherein the loopedportion extends from a first opening of the body.
 18. The bone fixingassembly of claim 13, wherein the threaded closure member extendsthrough a bore of the compression member.
 19. The bone fixing assemblyof claim 18, wherein the bore of the compression member is axiallyaligned with a threaded bore of the body to receive the threaded closuremember therethrough.
 20. The bone fixing assembly of claim 13, whereinthe compression member is hingedly attached to the body.